Where are you seeing orders of magnitude lower R2 bills? The storage price for S3 is $0.023 per GB, and the price for CF is $0.015 per GB. The operation pricing is even more similar - S3 is $5/million writes and $0.40/million reads, while Cloudflare is $4.50/million writes and $0.36/million reads.
In my experience even backblaze b2 performs (way) better.
Their community forums are full of such reports.
KV is so expensive that itβs barely usable, and like R2, is very slow.